<template>
  <div class="top-category">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <transition name="fade-right" mode="out-in">
          <!-- 加上key属性关联ID才会创建和移除 -->
          <XtxBreadItem :key="topCategory.id">{{ topCategory.name }}</XtxBreadItem>
        </transition>
      </XtxBread>
      <!-- 轮播图 -->
      <XtxCarousel :sliders="sliders" style="height:500px" />
      <!-- 所有二级分类 -->
      <div class="sub-list">
        <h3>全部分类</h3>
        <ul v-if="topCategory.children">
          <li v-for="item in topCategory.children" :key="item.id">
            <RouterLink :to="`/cate/sub/${item.id}`">
              <img :src="item.picture">
              <p>{{ item.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
      <!-- 不同分类商品 -->
      <div class="ref-goods" v-for="item in categoryList" :key="item.id">
        <div class="head">
          <h3>- {{ item.name }} -</h3>
          <p class="tag">温暖柔软，品质之选</p>
          <XtxMore />
        </div>
        <div class="body" v-if="item.goods">
          <GoodsItem :good="good" v-for="good in item.goods" :key="good.id" />
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { findBanner } from '@/api/home'
import { findTopCategory } from '@/api/category'
import { computed, ref, watch } from 'vue'
import GoodsItem from './components/goods-item.vue'
import { useStore } from 'vuex'
import { useRoute } from 'vue-router'
export default {
  name: 'TopCategory',
  components: {
    GoodsItem
  },
  setup() {
    console.log('step')
    const store = useStore()
    const route = useRoute()
    // 轮播图
    const sliders = ref([])
    findBanner().then(data => {
      sliders.value = data.result
    })
    // 获取当前的分类及当前分类的子分类
    const topCategory = computed(() => {
      let cate = {}
      const item = store.state.cate.cateList.find(item => {
        return item.id === route.params.id
      })
      if (item) cate = item
      return cate
    })
    // 获取当前分类下的子分类的商品数据
    const categoryList = ref([])
    const getSubList = () => {
      findTopCategory(route.params.id).then(data => {
        categoryList.value = data.result.children
      })
    }
    // 如果组件的路由规则没有改变，那么组件数据是不会更新，所以需要通过监听路由地址的改变，并且当前的路由是一级路由时触发
    watch(() => route.params.id, (newVal) => {
      if (newVal && (route.path === `/cate/${route.params.id}`)) {
        getSubList()
      }
    }, { immediate: true })
    return { sliders, topCategory, categoryList }
  }
}
</script>
<style scoped lang="less">
.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }

  .sub-list {
    margin-top: 20px;
    background-color: #fff;

    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;

      li {
        width: 168px;
        height: 160px;

        a {
          text-align: center;
          display: block;
          font-size: 16px;

          img {
            width: 100px;
            height: 100px;
          }

          p {
            line-height: 40px;
          }

          &:hover {
            color: @xtxColor;
          }
        }
      }
    }
  }

  .ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;

    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }

      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }

    .body {
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      padding: 0 65px 30px;
    }
  }

}
</style>